Measurements for beam sideplates for balljoint beam

[jughead]

Hi guys,

I have a 1970 lowlight and I'm in the process of narrowing the beam. Does anyone have the measurements for sideplates?

I have the later balljoint bolt pattern 130mm (I'm from Australia, we work in metric) = 5.118110236226" (sorry I converted this using an online converter)

I have this drawing but when I upscale it some of the measurements don't seem correct.

Thanks,
Jughead

[mr. warehouse]

I am not 100% sure that is drawn to scale.
I've seen it in the past as well, but never used it.